Spectrum Pocket filters have a high surface area , allowing for greater airflow and longer filter life. They are typically made of synthetic or glass fibers and are available in several ranges of efficiencies. Spectra Cell compact minipleat filters are pleated filters that provide a higher filtration surface area. They are available in different range of efficiencies for general ventilation applications and are often used in applications that require high airflow and low pressure drop. Spectra Cell Deep pleat filters are designed for applications that require high filtration efficiency and low pressure drop. They are available in a multiple range of efficiencies and are typically made of synthetic or glass fibers. When selecting air filters for general ventilation applications, it is important to consider the specific requirements of the application, such as the size and type of particles to be removed, as well as the airflow rate and pressure drop of the system. It is also important to choose filters compatible with the HVAC system and follow the manufacturer's recommendations for filter replacement and maintenance.